[PATCH 1/4] libstdc++: Import parts of the Ryu library

[Jonathan Wakely]

On 14/07/20 15:41 -0400, Patrick Palka via Libstdc++ wrote:
>This imports the source files from the Ryu library that define
>d2s_buffered_n, f2s_buffered_n, d2fixed_buffered_n and d2exp_buffered_n
>and generic_binary_to_decimal, which we're going to need as part of our
>std::to_chars implementation.
>
>libstdc++-v3/ChangeLog:
>
>	* src/c++17/ryu/MERGE: New file.
>	* src/c++17/ryu/common.h, src/c++17/ryu/d2fixed.c,
>	src/c++17/ryu/d2fixed_full_table.h, src/c++17/ryu/d2s.c,
>	src/c++17/ryu/d2s_full_table.h, src/c++17/ryu/d2s_intrinsics.h,
>	src/c++17/ryu/digit_table.h, src/c++17/ryu/f2s.c,
>	src/c++17/ryu/f2s_instrinsics.h,
>	src/c++17/ryu/generic_128.c, src/c++17/ryu/generic_128.h,
>	src/c++17/ryu/ryu_generic_128.h: Import these files from the
>	Ryu library.


OK for trunk.